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‘I just want you to know that I'd be more than happy to carry if that would help you to have a family,’ Knott told her younger sister at the time, according to NBC4i.com.

On Valentine's Day, they retrieved eggs from Johnston and fertilised them with her husband's sperm.

‘Very romantic,’ jokes Johnston.

Sacrifice: Chrissy Knott, pictured with the quadruplets, already has two children - both boys - but offered to be a gestational carrier and ended up carrying twins for her sister, Annie

Own family: Chrissy Knott with her two sons and husband. She also bore two children for her sister, Annie

Double whammy: Doctors implanted two embryos in Knott, left, and since Johnston, right, was on the same cycle, they decided to implant two embryos in her too, to increase their chances of having at least one child